From nobody Fri Oct 3 11:40:38 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1579804216; cv=none; d=zohomail.com; s=zohoarc; b=LDzj9fLhLUiaiLz4zTKO1iTxnyhQ4wl9qoPb2JJaELOEh2GSELOxim705+W0FXijqIAzRzDjaevOBTkn7v6t9X+ml5jXB9Kw6+EZI5tv3e3t0cLXfOxrPz24eon7kWYpy2WSMO7saYhz4kyohFwZc8hoZOagmG6NWrpW+JyNDeE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1579804216; h=Content-Type:Content-Transfer-Encoding:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=jI2BIHNRFTBCHwS7byo7jj/dJYediopJO6Eq5eVljCI=; b=fze/P03RSYhIYhLAuWig2q41177+ptYZPosDHbFLxqA+/l0mkbRlo1hm/EzXOBLomZv501bHX1Lin/EmS+jfWgl9UkNWPBEq5Vw3oWHTuZf8hy4YRWa/JSI/LdYmy6SGIieckfRywoRNs8x1+olSRKnt35KgCoawkaoR/77XU7A= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1579804216667752.8150378481213; Thu, 23 Jan 2020 10:30:16 -0800 (PST) Received: from localhost ([::1]:34774 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuhF9-0006OW-5b for importer@patchew.org; Thu, 23 Jan 2020 13:30:15 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:41492) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iufeC-0005GJ-4Z for qemu-devel@nongnu.org; Thu, 23 Jan 2020 11:48:01 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iufeA-0006j5-Ur for qemu-devel@nongnu.org; Thu, 23 Jan 2020 11:48:00 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:47839 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iufeA-0006ie-Rx for qemu-devel@nongnu.org; Thu, 23 Jan 2020 11:47:58 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-71-CSBMllOLO4KngZmXNa3y8A-1; Thu, 23 Jan 2020 11:47:56 -0500 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B272E8026AF for ; Thu, 23 Jan 2020 16:47:55 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-116-110.ams2.redhat.com [10.36.116.110]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0C81E19C69; Thu, 23 Jan 2020 16:47:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579798078; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jI2BIHNRFTBCHwS7byo7jj/dJYediopJO6Eq5eVljCI=; b=WegILUPyRRVJZcbVW1G7Db+nBl0jYqDrUFxO+UpNGpHHS/s1YrXNexKSO0q3mW6NBEcHP/ 8I7d2KccWGOHOdbccPYXdXOj1dgou7rnkedkGqxqY6uBnuKXgmucNsP8dqck3T567OK99R KROlUjFcCaJ7VcnAP6X5P3dpKMU1xmg= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com Subject: [PULL 056/108] virtiofsd: set maximum RLIMIT_NOFILE limit Date: Thu, 23 Jan 2020 16:45:38 +0000 Message-Id: <20200123164630.91498-57-dgilbert@redhat.com> In-Reply-To: <20200123164630.91498-1-dgilbert@redhat.com> References: <20200123164630.91498-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: CSBMllOLO4KngZmXNa3y8A-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: Stefan Hajnoczi virtiofsd can exceed the default open file descriptor limit easily on most systems. Take advantage of the fact that it runs as root to raise the limit. Signed-off-by: Stefan Hajnoczi Reviewed-by: Daniel P. Berrang=C3=A9 Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Dr. David Alan Gilbert --- tools/virtiofsd/passthrough_ll.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough= _ll.c index d53cb1e005..c281d817af 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -53,6 +53,7 @@ #include #include #include +#include #include #include #include @@ -2268,6 +2269,35 @@ static void setup_sandbox(struct lo_data *lo, struct= fuse_session *se) setup_seccomp(); } =20 +/* Raise the maximum number of open file descriptors */ +static void setup_nofile_rlimit(void) +{ + const rlim_t max_fds =3D 1000000; + struct rlimit rlim; + + if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { + fuse_log(FUSE_LOG_ERR, "getrlimit(RLIMIT_NOFILE): %m\n"); + exit(1); + } + + if (rlim.rlim_cur >=3D max_fds) { + return; /* nothing to do */ + } + + rlim.rlim_cur =3D max_fds; + rlim.rlim_max =3D max_fds; + + if (setrlimit(RLIMIT_NOFILE, &rlim) < 0) { + /* Ignore SELinux denials */ + if (errno =3D=3D EPERM) { + return; + } + + fuse_log(FUSE_LOG_ERR, "setrlimit(RLIMIT_NOFILE): %m\n"); + exit(1); + } +} + int main(int argc, char *argv[]) { struct fuse_args args =3D FUSE_ARGS_INIT(argc, argv); @@ -2389,6 +2419,8 @@ int main(int argc, char *argv[]) =20 fuse_daemonize(opts.foreground); =20 + setup_nofile_rlimit(); + /* Must be before sandbox since it wants /proc */ setup_capng(); =20 --=20 2.24.1